v0.5.3

Added

• On Linux and macOS, a more descriptive error is printed when setting up the tun
  device fails because a device with the same name already exists.
• Seqno request cache, to avoid spamming peers with duplicate seqno requests and
  to make sure seqno's are forwarded to different peers.
• Added myceliumd-private binary, which contains private network functionality.
• Added API endpoint to retrieve the public key associated with an IP.
• The CLI can now be used to list, remove or add peers (see mycelium peers --help)
• The CLI can now be used to list selected and fallback routes (see mycelium routes --help)

Changed

• We now send seqno requests to all peers who advertised a subnet if the selected
  route to it is lost as a result of the next-hop dying, or and update coming in
  which causes no routes to be feasible anymore.
• Switched from the log to the tracing ecosystem.
• Only do the periodic route announcement every 5 minutes instead of every minute.
• Mycelium binary is no longer part of the workspace, and no longer contains private
  network functionality.
• If a packet received from a peer can't be forwarded to the router, terminate the
  connection to the peer.

Fixed

• Manually implement Hash for Subnet, previously we could potentially have multiple
  distinct entries in the source table for the same source key.